Pouring spout



Oct. 4, 1932. c P E 1,881,228

POURING SPOUT Filed April 20, 1929 INVENTOR,

(/2 ea zer Pap 8. BY

ATTORNEY Patented Oct. 4, 1932 CHESTER H. PAPE', F PORTLAND, OREGONrename srou'r Application filed April 20,

for furnaces and containers of material maintained at substantially hightemperatures and which materials at such temperatures adhere. to castiron and other metal spouts. Because of such adhesion, it is commonpractice to provide spouts of soap stone or similar material to whichsuch matter does not adhere. Soap stone is a very fragile material andrelatively short lived for this reason.

My invention relates especially to furnaces in which the residual blackliquor taken from the sulphite process of making paper is sprayed andincompletely burned,the resi-' due forming a molten slag. I havediscovered that if a cast metal pouring spout is maintained at asubstantiallylower temperature than the heat of the slag, that suchadhesion will not take place. The molten slag passing over such cooledsurface sets up tremendous strains in the spout itself due todifferences in temperature thruout the thickness of thespout and suchstrains tend to break down such material and in a water cooled wroughtiron, or of similar material having the property of high tensilestrength, are used to constitute the'conduits for the cooling water thatsuch differential strains, although cracking the cast metal spout, willnot fracture such conduits, which thus serve as a sealing medium. Thisis especially true if the pipes are continuous, that is, made of asingle length of pipe without couplings '01,- other projecting jointsand if such pipes or tubes-are covered with a protective material priorto their insertion' into such cast metal spout to prevent the .moltenmetal from adhering to the surface of the pipe. Such coating can bedestructible under the action of the molten metal, so that'an airchamber is created between the exteriorjof the pipe'and the bore of theopening in the casting. Such coating material may also be of materialre- 1929. Serial No. 356,767.

fractory to heat but non-adhesive to the molten metal, so as to permitdifferential expansion in the pipe and in such casting. The end to beattained in either case is to prevent the differential strains set up inthe casting, because of unequal application of heat, from rupturing orfracturing the pipe.-

The details of construction and the mode of operation of my inventionare hereinafter described with reference to the accompanying drawing, inwhich: v

Fig. 1 is an elevation showing a typical installation of a spout of thischaracter;

Fig. 2 is a plan view of such spout showing the arrangement of thecooling passageways therein and Fig. 3 is a transverse section thru suchspout showing the arrangement of the pipes constituting the coolingpassageways located in the spouts.

My improved spout is adapted to be used in connection with a furnace orcontainer a having a sloping bottom a leading to a discharge opening a2thru one side, under which my improved pouring spout b is located. Oneend of such spout rests upon a shoulder a and extends laterallytherefrom, the free end being supported by angularly disposed rods d, orsimilar tension members, extending upwardly from such free end. Suchrods are fastened to lugs 6 formed upon the sides of the spout. Themolten slag discharges from the end of the spout 1) into a receiver e,from-which it is carried off by a suitable apparatus which has'nobearing upon this invention.

Such spout is preferably elongated and the pouring surface 52 is troughshaped, preferably curved laterally, and the spout is of substantiallyuniform cross section. Located centrally in such spout is a continuouscoil of pipe or tube f, with which my invention is particularlyconcerned, which pipe or tube defines a tortuous passageway for thecooling water and lies under the pouring surface b2 of the spout, forsubstantially its entire length and breadth. In practice it is notpractical to obtain a length of pipe sufficiently long to constitute theentire coil f and thus several lengths of pipe are joined together bywelding, so that such pipe has a uniform external diameter and iswithout threaded connections. The ends of such coil extend upwardly andare connected to a supply of water which circulates thru the coil eitherunder 'pumped pressure-or by thermosiphon means, preferably by theformer means." Such pipe is covered by a layer of material fromone-eighth of an inch thick 'to one-sixteenth of an inch thick prior toin- 'sertion in the mold in which the spout b is 'cast. The preferablecoating material for the pipe is made of a mixture of approximatelyequalparts of graphite and shellac.

The end to be attained is to provide a layer of material or coatingoverthe pipe which prevents the adherence-of the molten metal of whichthe spout is made upon the pipes during such coating process and suchmaterial is either refractory to heat and does not adhere to the castmetal or the heat destroys the consistency of the coating so that ittion remaining of a protective coating of being separated from said bodyby any portion remaining of a protective coating of material comprisinga mixture of graphite and shellac, which material shcathes said conduitlvvlilen the latter is encompassed by said cast In testimony-whereof hehas aflixed his.

signature. I I CHESTER H. PAPE.

crumbles away to leave an air space surrounding the pipe and inside ofthe passageways in the spout in which the pipe lies. The absence ofprojecting portions in the pipe permits independent expansion andcontraction-which eliminates the developing of differential stresstending to fracture the pipe and the freedom of adhesion between thecast' metal spout and the pipe prevents.

strains set up in the spout from being transmitted to the pipe. passedover such spout in the installation which I'am describing and which Ihave illustrated in Fig. 1 attains-a temperature of aproximately twothousand degrees F. while it is desirable to keep the spout as close toatmospheric temperature as possible. Thus the upper surface of 52 of thespout tends to elongate, because it is in direct contact with suchhotliquid and such elongation and such tendency towards elongation is sosevere The liquid material.

that fissures and cracks-are formed which extend from such surface Iclaim: 1. In a pouring spout comprising a cast bod defining-atrough-like surface adapted inwardly of the spout.

to 'rect hot liquid substances and a cooling conduit loosely housedwithin said body at "a point immediately belowsaid'surface.

- 2. In a pouring spout comprising a cast body defining a trough-likesurface. adapted to direct hot liquid substances, a cooling conduitloosely housed within said'body at a point immediately below saidsurface, said conduit extending substantially the entire length andbreadth of said trough-like sur ace. 3. In a pouring spout comprising acast body defining a trough-like surface adapted to direct hot liquidsubstances, a cooling conduit housed within said body a; a pointimmediately between said surface, said conduit beingsepara-ted from-saidbody by any por is encompassed by said cast

